* Installing *source* package 'uroot' ... ** R ** data ** inst ** preparing package for lazy loading Loading required package: tcltk Loading Tcl/Tk interface ... done Error in structure(.External("dotTclObjv", objv, PACKAGE = "tcltk"), class = "tclObj") : [tcl] invalid command name "Tree". In addition: Warning message: Tcl package 'BWidget' not found in: tclRequire("BWidget") Error: unable to load R code in package 'uroot' Execution halted ERROR: lazy loading failed for package 'uroot'